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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

DYNAMICAL INSTABILITY OF WHITE DWARFS AND BREAKING OF SPHERICAL SYMMETRY UNDER THE PRESENCE OF EXTREME MAGNETIC FIELDS

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Autor(es):
Coelho, J. G. [1, 2, 3, 4] ; Marinho, R. M. [4] ; Malheiro, M. [4] ; Negreiros, R. [5] ; Caceres, D. L. [1, 2, 3] ; Rueda, J. A. [1, 2, 3] ; Ruffini, R. [1, 2, 3]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome - Italy
[2] Univ Roma La Sapienza, ICRA, I-00185 Rome - Italy
[3] ICRANet, I-65122 Pescara - Italy
[4] ITA, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[5] Univ Fed Fluminense, Inst Fis, BR-24210346 Niteroi, RJ - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: ASTROPHYSICAL JOURNAL; v. 794, n. 1 OCT 10 2014.
Citações Web of Science: 20
Resumo

Massive, highly magnetized white dwarfs with fields up to 10(9) G have been observed and theoretically used for the description of a variety of astrophysical phenomena. Ultramagnetized white dwarfs with uniform interior fields up to 10(18) G have been recently purported to obey a new maximum mass limit, M-max approximate to 2.58 M-circle dot, which largely overcomes the traditional Chandrasekhar value, M-Ch approximate to 1.44 M-circle dot. Such a larger limit would make these astrophysical objects viable candidates for the explanation of the superluminous population of Type Ia supernovae. We show that several macro and micro physical aspects such as gravitational, dynamical stability, breaking of spherical symmetry, general relativity, inverse beta decay, and pycnonuclear fusion reactions are of most relevance for the self-consistent description of the structure and assessment of stability of these objects. It is shown in this work that the first family of magnetized white dwarfs indeed satisfy all the criteria of stability, while the ultramagnetized white dwarfs are very unlikely to exist in nature since they violate minimal requests of stability. Therefore, the canonical Chandrasekhar mass limit of white dwarfs still has to be applied. (AU)

Processo FAPESP: 13/26258-4 - Matéria superdensa no universo
Beneficiário:Manuel Máximo Bastos Malheiro de Oliveira
Linha de fomento: Auxílio à Pesquisa - Temático